Lack of association between autonomously functioning thyroid nodules and germline polymorphisms of the thyrotropin receptor and Gαs genes in a mild to moderate iodine-deficient Caucasian population.

Abstract:

BACKGROUND:Mutations of the thyrotropin receptor (TSHR) and/or Gαs gene have been found in a number of, but not all, autonomously functioning thyroid nodules (AFTNs). Recently, in a 15-year-old girl with a hyperfunctioning papillary thyroid carcinoma, we found two somatic and germline single nucleotide polymorphisms (SNPs): a SNP of the TSHR gene (exon 7, codon 187) and a SNP of Gαs gene (exon 8, codon 185). The same silent SNP of the TSHR gene had been reported in patients with AFTN or familial non-autoimmune hyperthyroidism. No further data about the prevalence of the two SNPs in AFTNs as well as in the general population are available in the literature. AIM:To clarify the possible role of these SNPs in predisposing to AFTN. METHODS:Germline DNA was extracted from blood leukocytes of 115 patients with AFTNs (43 males and 72 females, aged 31-85 years, mean ± SD = 64 ± 13) and 100 sex-matched healthy individuals from the same geographic area, which is marginally iodine deficient. The genotype distribution of the two SNPs was investigated by restriction fragment length polymorphism-polymerase chain reaction. RESULTS:The prevalence of the two SNPs in our study population was low and not different to that found in healthy individuals: 8 % of patients vs. 9 % of controls were heterozygous for the TSHR SNP and 4 % patients vs. 6 % controls were heterozygous for the Gαs SNP. One patient harbored both SNPs. CONCLUSIONS:These results suggest that these two SNPs do not confer susceptibility for the development of AFTN.

journal_name

J Endocrinol Invest

authors

Vicchio TM,Giovinazzo S,Certo R,Cucinotta M,Micali C,Baldari S,Benvenga S,Trimarchi F,Campennì A,Ruggeri RM

doi

10.1007/s40618-014-0081-x

subject

Has Abstract

pub_date

2014-07-01 00:00:00

pages

625-30

issue

7

eissn

0391-4097

issn

1720-8386

journal_volume

37

pub_type

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